Several of our companions from Ahmad b. Muhammad b. Khalid from his father from Fadala b. Ayyub from Hamza b. Muhammad at-Tayyar from Abu `Abdillah عليه السلام.

He said: There is nothing in which there is expansion or reduction of the matters that Allah has commanded or has prohibited except that Allah عز وجل therein has a testing and a decree. (al-Kafi, Volume 1, hadith 385)